Tool for replacing and removing keys on poppet valves



C. D. MARSHALL Nov. 27, 1962 TOOL FOR REPLACING AND REMOVING KEYS ON POPPET VALVES Filed Oct. 22, 1959 2 Sheets-Sheet 1 2 Ill/Ir/lfll/ Z /ii E. ww

ATTORNEYS Nov. 27, 1962 c. D. MARSHALL 3,065,523

TOOLFOR REPLACING AND REMOVING KEYS ON POPPET VALVES Filed 001;. 22. 1959 2 Sheets-Sheet 2 ClQ/I/Xi/PSHALL 1 INVENTOR 1 I Y fl 1 I 1 ATTORNEYS Sta This invention relates to a tool for inserting keys on and removing them from the stems of poppet valves.

The object of the present invention is to provide a tool which will at the same time insert both halves of a valve key.

Another object of the present invention is to provide a tool which will both depress the valve spring and insert the valve key in successive parts of a single stroke.

A further object of the present invention is to provide a tool which will both depress the valve spring and remove the valve key in successive parts of a single stroke.

Still other objects, advantages and improvements will become apparent from the following specification, taken in connection with the accompanying drawings, in which:

FIGURE 1 is a side elevational view, partly in section, showing a key inserting tool according to the present invention.

FIG. 2 is an under plan view of the key according to FIG. 1.

FIG. 3 is a sectional view showing the tool applied to a poppet valve.

FIG. 4 is a detail sectional view of the key inserting plunger used in the tool according to the present invention.

FIG. 5 is a sectional view of an adaptor for use with a tool according to the present invention.

FIG. 6 is a partial sectional view of a key removing plunger used in the tool according to the present invention.

FIG. 7 is a partial sectional view of the key removing plunger with the key removing element shown in section.

FIG. 8 is an under plan view of the key removing plunger according to FIGS. 6 and 7.

Referring now to the drawings in detail and to FIG. 1 in particular, the tool as shown here has a cylindrical handle 10, which is preferably knurled on its outside, and which has an axial bore 11 and a counter bore 12. Within the bore 11 and counter bore 12 there is slidably positioned an operating rod 13 which is screw threaded at its opposite ends. At its upper end the operating rod is provided with a knob 14 and at its lower end is secured by screw threads 15 in an axially positioned bore in a valve spring depressor 17. The valve spring depressor 17 has a flared upper end 16 and a flared lower end 18. Along the axis of the valve spring depressor 17 there is formed from the lower end a bore 19 and a counter bore 20.

A valve key holder 21 is slidably mounted within the bore 19 and the counter bore 20 inside of the valve spring depressor 17. The valve key holder 21 is held within the bore 19 by a coil spring 22, which frictionally engages both the plunger and the inner wall of the bore. At the lower end of the valve key holder 21 is formed an enlarged section or skirt 24, which meets the main cylindrical section in a shoulder 23, on which the lower end of the coil spring 22 seats.

The valve key holder 21 is formed with an internal bore 25, which extends axially from the bottom for approximately half the length thereof. Also, there is a counter bore 28 in the face of the enlarged bottom section 24, which unites with the axial bore in a chamfered section 26, forming an internal shoulder. Two holes 29 extend between the external shoulder 23 and the internal chamfered section 26. Two holes 29-29 extend between the external shoulder 23 and the internal chamfered 3,065,528 Patented Nov. 27, 1962 section 26, parallel to the axis of the plunger and positioned on the opposite sides of the latter.

In FIG. 3 the tool for replacing keys is shown as applied to either the intake or exhaust valve stem on an overhead valve engine. It is, of course, equally applicable to the overhead inlet valve in an F head engine. A reciprocable poppet valve push rod is shown at 30. Adjacent its upper end the push rod has an annular groove 31 in which the keys 32 fit.

A cup 34 has a central hole 35 for receiving the valve push rod 30, a counter bore 36, a horizontal shoulder 37 at the top of the counter bore 36, and an outwardly extending flange 38. Between the cup 34 and some part of the cylinder head, designated generally at 39, there is positioned a coiled compression spring 40, which also surrounds the valve push rod, and abuts the flange 38 on the cup 34 at its upper end.

Generally when the keys 32 have been removed from the annular groove 31 in the valve push rod 30, the compression spring 40 will force the cup 34 upwardly to a level, where the flange 35 on the latter is about even with, or slightly above, the annular groove 31. The keys 32 are semi-cylindrical in shape, and each half has an internal flange 33 at approximately its mid-height. With the cup 34 in the relative position with respect to the top of the valve push rod 30, as shown in FIG. 3, two of the keys 3232 may be gripped by the operator between his fingers and positioned on the opposite sides of the valve push rod, above the annular recess 31 in the latter. Then the valve key holder 21 will be positioned over the valve push rod 30, with the keys 3232 within the counter bore 28 in the enlarged bottom section 24 of the plunger and their tops abutting the internal shoulder 26 at the top of the counter bore. The handle 10 is then brought downwardly with considerable force, striking the upper end 16 of the valve spring depressor 17, and the lower end 18 of the latter in turn striking the shoulder 37 on the cup 34, depressing the latter against the action of the coiled compression spring 37. The coiled spring 22 Will be fully compressed, the inner end of the axial bore 19 in the valve spring depressor 17 striking the upper end of the valve key holder 21 and the enlarged bottom section 24 of the valve key holder driving the keys 3232 downwardly along the top of the valve push rod 30 until the internal flanges 33 on the keys are received within the annular groove 31 in the push rod. The tool is now removed from the push rod and, as the enlarged bottom section 24 of the valve key holder 21 releases the keys 3232 from the counter bore 28, the cup 34 will rise under the action of the coiled compression spring 40, the counter bore 36 in the cup encompassing the keys and retaining them in position in the annular groove 31 in the valve push rod.

If either or both the keys 32 should become stuck within the counter bore 28 in the lower end of the valve key holder 21, they may be dislodged therefrom by inserting a wire or a long nail through one or both the holes 29 in the enlarged bottom section 24 of the plunger.

In FIG. 4 there is shown a modified form of the valve key holder 21. The enlarged bottom section 24 is united with the main cylindrical body section in a radially extending shoulder 42. Also, the axial bore 25 extends entirely through the valve key holder 21 and is internally threaded at its upper end at 43. A stud bolt 44 is positioned in the upper threaded end 43 of the valve key holder 21 and within the coiled compression spring 22. Upon inward movement of the valve key holder 21, the head of the stud bolt 44 will abut the end of the bore 19 in the valve spring depressor 17, acting as a stop. This stop means provides for variable positioning of the enlarged bottom section 24 of the valve key holder 21 with respect to the lower end 18 of the valve spring depressor.

In FIG. there is shown an adapter which provides for the tool being used on cups of different shape, for

instance a cup which does not have a shoulder 37, but in which the top face of the flange 38 is plane to the outer diameter of the counter bore 36. The adapter is com prised by a cylindrical sleeve 45 and an integral cylindrical bottom section 46. ,An axial bore 47 is formed part way through the cylindrical bottom section 46, a counter bore 48 through the remainder of the cylindrical bottom section and the sleeve 45, and a counter bore 4 9 from the face of the cylindrical bottom section.

In use the sleeve 45 of the adapter fits within the bore 20 in the lower end 18 of the valve spring depressor 17 and the cylindrical bottom section 24 of the valve key holder 21 is received within the bore 47.

FIGS. 6, 7 and 8 show the valve spring depressor 17 with the key removing element mounted within same. This element is comprised principally by a cylindrical mounting block 50 and a cylindrical permanent magnet 56 carried thereby. The mounting block is received within the bore 19 of the valve spring depressor 17. It is removably held therein by a spring pressed detent. A bore 51 extends diametrically of the mounting block but not entirely through same. Within the bore 51 there is a coiled spring 52 whichbiases a ball 53 into engagement with the wall of the bore 19. An annular groove 54 of semi-circular cross section is provided at the proper height within the bore 19 to receive the ball 53.

The mounting block 50 has an axial bore 55 extending from the bottom for approximately half of its length. Within the bore 55 there is slidably mounted a cylindrical'permanent magnet 56. A coiled spring 57, is

mounted within the bore 55, with the lower end secured to the trip et the cylindrical magnet 56 and its top coil within anannular recess 58 formed at the'inner end of the bore 55. p

In use the valve spring depressor 17, with the mounting block 50 and the cylindrical magnet 56 in the position shown in FIG.,6, is positioned over the topof the valve push rod 30.' The handle is then brought down with considerable force, strflring the upper end it of the valve spring depressor '17. The lower end 18 of the in the lower endof the valve spring depressor. The

coiled spring 57 yields and the cylindrical'magnet 56 moves upwardly within the axial bore 55 within the block 50 until the keys 3232 within the counter bore in the lower endtof the valve spring depressor 17 reach the top of the ,valve push rod, where they are attracted by the cylindrical magnet 56. The tool is then removed from the valve push rod 30, carrying the keys 3232 with it.-

Having now fully 7 described my invention, what I claim as new and useful and desire to secure by Letters Patent of the United States is:

An impact tool for inserting split keys having flanges engaging in the annular groove in a poppet push valve of r the type having a spring abutting cup surrounding a valve holder in turn strikes the flange 38 on the valve cup 34,

' holder including a stern insertedv in said bore in said depress-or and an enlarged lowerend forming a shoulder, a spring seated in said bore and engaging said shoulder, an internal bore in said holder, a counter bore in the lower end of said holder chamfered at its upper end to form a sloping surfaced intersection with said bore in said holder; said last-mentioned counter; bore receiving and holding the split keys; saidenlarged lower end of said holder having aligned holes therein opening at their extremities throughsaid shoulder formed by said enlarged end exteriorly of said holder and through said sloping surfaced intersection of said bore andsaid counter bore internally ing the tool.

"References Cited in the file of this patent UNITED STATES PATENTS 2,069,133 Clossey Jan. 26, 1937 2,177,232 'Tinnermanhu Oct. 2-4, 1939' 2,422,549 Hogin June 17, 1947 2,427,045 7 Cook Sept. 9, 1947 2,742,689 Rocha Apr. 24, 1956 

